Worksheet 289 · Skill 3

Dead reckoning

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1. At 1515 you fix your position 191°T, 1.8 nm from Tern Island tower. You steer 080°T at 6.9 kn until 1540, then 151°T at 4.4 kn until 1555.

   Give the 1555 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

2. At 1335 you fix your position 202°T, 2.2 nm from Gannet Rock daybeacon. You steer 286°T at 7.2 kn until 1355, then 046°T at 5.2 kn until 1430.

   Give the 1430 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

3. At 1420 you fix your position 231°T, 2.0 nm from Tern Island tower. You steer 169°T at 6.9 kn until 1435, then 054°T at 4.0 kn until 1510.

   Give the 1510 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

4. At 0850 you fix your position 056°T, 3.7 nm from Westfield church spire. You steer 176°T at 4.0 kn until 0910, then 057°T at 8.9 kn until 0940.

   Give the 0940 DR position as the true bearing FROM Tern Island tower to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

5. At 1410 you fix your position 353°T, 2.0 nm from Mill stack. You steer 256°T at 8.8 kn until 1420, then 336°T at 4.3 kn until 1445.

   Give the 1445 DR position as the true bearing FROM Heron Point Light to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Heron Point Light: ________ °T   Distance: ________ nm  

6. At 1445 you fix your position 284°T, 4.0 nm from Tern Island tower. You steer 175°T at 8.0 kn until 1520, then 324°T at 8.5 kn until 1550.

   Give the 1550 DR position as the true bearing FROM Westfield church spire to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Westfield church spire: ________ °T   Distance: ________ nm  

7. At 0800 you fix your position 111°T, 2.1 nm from Westfield church spire. You steer 062°T at 6.8 kn until 0840, then 029°T at 7.6 kn until 0900.

   Give the 0900 DR position as the true bearing FROM Tern Island tower to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

8. At 1045 you fix your position 338°T, 1.5 nm from Heron Point Light. You steer 109°T at 4.0 kn until 1055, then 305°T at 7.0 kn until 1115.

   Give the 1115 DR position as the true bearing FROM Westfield church spire to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Westfield church spire: ________ °T   Distance: ________ nm